Calculate the perimeter of a quadrant of circle of radius is 9 cm.

Find the circumference of the circle:

2 x pi x r = 2 x pi x 9 = 56.5714 cm

A quadrant is 1/4 of a full circle.

Find 1/4 of the circumference:

56.5714/4 = 14.1429

Now add two radius to that to get the perimeter:

14.1429 + 9 + 9 = 32.1429 cm

Round the answer as needed.

answer: hence, function will be

explanation:

since we have given that

cost of a new textbook = $85

according to question, the resale value of a textbook decreases by 25% with each previous owner,

so, our function becomes,

here, y is the total value of the text book after x owners.

hence, function will be